Make web api sampler stand-alone.
Add solaruser.user_auth_token_node to associate specific nodes with auth
tokens.
Implement support for solaruser.user_auth_token_node table.
Make sure to grab "best" service always, so AOP service always used if
available.
Add AuthenticatedToken API to support tokens with associated IDs, e.g.
node data tokens with specific node IDs.
Use new AuthenticatedToken API to support data query tokens.
Use new token API to support data query tokens.
Implement support for data token management in SolarUser app.
Add more authorization access checks.
Add /datum web API methods for querying on data.